PCF2119RUSLASH2 datasheet(10/68 Pages) PHILIPS

10 / 68 page

2003 Jan 30

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2119X

7.12

Character Generator ROM (CGROM)

The Character Generator ROM generates 240 character

patterns in a 5

× 8 dot format from 8-bit character codes.

Figures 6 to 10 shows the character sets that are currently

implemented.

7.13

Character Generator RAM (CGRAM)

Up to 16 user defined characters may be stored in the

Character Generator RAM. Some CGRAM characters

(see Fig.19) are also used to drive icons (6 if icons blink

and both icon rows are used in the application; 3 if no blink

but both icon rows are used in the application; 0 if no icons

are driven by the icon rows). The CGROM and CGRAM

use a common address space, of which the first column is

reserved for the CGRAM (see Fig.6 to Fig.10). Figure 11

shows the addressing principle for the CGRAM.

7.14

Cursor control circuit

The cursor control circuit generates the cursor (underline

and/or cursor blink as shown in Fig.5) at the DDRAM

address contained in the address counter.

When the address counter contains the CGRAM address

the cursor will be inhibited.

7.15

Timing generator

The timing generator produces the various signals

required to drive the internal circuitry. Internal chip

operation is not disturbed by operations on the data buses.

7.16

LCD row and column drivers

The PCF2119x contains 18 row and 80 column drivers,

which connect the appropriate LCD bias voltages in

sequence to the display in accordance with the data to be

displayed. R17 and R18 drive the icon rows.

The bias voltages and the timing are selected

automatically when the number of lines in the display is

selected. Figures 12 to 15 show typical waveforms.

Unused outputs should be left unconnected.

Fig.5 Cursor and blink display examples.

MGA801

cursor

5 x 7 dot character font

alternating display

cursor display example

blink display example

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